Metamodel user guide
Action that waits for the specified condition to be true.
A change event occurs when the Boolean-valued expression becomes true. For example, as a result of a change in the value held in a slot corresponding to an attribute, or a change in the value referenced by a link corresponding to an association. A change event is raised implicitly and is not the result of an explicit action. Each time the value of the change expression changes from false to true, the change event action is triggered.
Figure 99 : AcceptChangeEventAction (1)
|string changeExpresion [1..1]|
A boolean-valued expression that will result in a change event whenever its value changes from false to true.